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<br />. <br /> <br />. <br /> <br />. <br /> <br />r-~ <br />--J <br />0) <br />~ <br /> <br />d. Reconnaissance Versus Site-specific Calibration Procedures <br /> <br />To retain the representative reach concept, the cal ibration <br />procedure did not entail the degree of detail that would be <br />normal for site-specific studies, even in instances where <br />sufficiently detailed cross-section data were available. <br />Rather, care was taken to preserve what were judged to be <br />reasonable depth and velocity predictions. <br /> <br />I. Analysis of Fish Habitat, Recreation Potent' ,I, and Water-use Impacts <br /> <br />1. <br /> <br />Determination of Maximum WUA <br /> <br />The calibrated WSP data deck was run with the HABTAT program which <br /> <br /> <br />makes use of response curves (see attachment F) for selected target <br /> <br /> <br />species. The response curves for the life stages of egg, fry, <br /> <br /> <br />juvenile, and adult are based upon the reaction of those life stages <br /> <br /> <br />to various levels of depth and velocity. When appropriate, curves <br /> <br /> <br />are also developed for the activities of spawning and passage as <br /> <br />affected by the above parameters. The output of the WSP hydraul ic <br /> <br /> <br />model in conjunction with the HABTAT program is in terms of weighted <br /> <br /> <br />usable area (WUA). This is not limited to fisheries, however. <br /> <br /> <br />Various stream-related recreational activities are responsive to the <br /> <br /> <br />parameters of depth and velocity and curves can be drawn to indicate <br /> <br /> <br />the response of activities such as kayaking, canoeing, fishing while <br /> <br /> <br />wading, etc. Using such curves, the WSP/HABTAT model output will <br /> <br /> <br />quantify WUA available for a specific form of recreation and thus <br /> <br /> <br />indicate recreational potential or changes therein. <br /> <br />49 <br />